Attachment 1: Specifications - Metropolitan Washington Airports ...

DCA TERMINAL A IMPROVEMENTS (NEAR TERM) 10 AUGUST 2012
TASK ORDER 03: LOBBY IMPROVEMENTS – PKG 4 - CURBSIDE CHECK-IN
RONALD REAGAN WASHINGTON NATIONAL AIRPORT
PROJECT DT1203
2.2 MISCELLANEOUS MATERIALS
A. Gaskets: As required to seal joints in decorative formed metal and remain weathertight; as
recommended in writing by decorative formed metal manufacturer.
B. Sealants, Exterior: ASTM C 920; elastomeric silicone sealant; of type, grade, class, and use
classifications required to seal joints in decorative formed metal and remain weathertight; and
as recommended in writing by decorative formed metal manufacturer.
C. Filler Metal and Electrodes: Provide type and alloy as necessary for strength, corrosion
resistance, and compatibility in fabricated items.
1. Use filler metals that will match the color of metal being joined.
D. Fasteners: Fabricated from same basic metal and alloy as fastened metal unless otherwise
indicated.
1. Provide tamper-resistant flat-head machine screws for exposed fasteners unless otherwise
indicated.
2.3 FABRICATION, GENERAL
A. Shop Assembly: Preassemble decorative formed metal items in shop to greatest extent possible
to minimize field splicing and assembly. Disassemble units only as necessary for shipping and
handling limitations. Clearly mark units for reassembly and coordinated installation.
B. Fold back exposed edges of unsupported sheet metal to form a 1/2-inch- wide hem on the
concealed side, or ease edges to a radius of approximately 1/32 inch and support with concealed
stiffeners.
C. Increase metal thickness or reinforce with concealed stiffeners, backing materials, or both, as
needed to provide surface flatness and sufficient strength for indicated use.
1. Support joints with concealed stiffeners as needed to hold exposed faces of adjoining
sheets in flush alignment.
D. Where welding or brazing is indicated, weld or braze joints and seams continuously. Grind, fill,
and dress to produce smooth, flush, exposed surfaces in which joints are not visible after
finishing is completed.
2.4 FILLER PANELS
A. Stainless-steel Laminate:
1. Laminate 0.0375-inch-thick, stainless-steel sheets to outside face of core and frames at
locations and to comply with details indicated. Use adhesive recommended by metal
fabricator that will fully bond metal to core and that will prevent telegraphing and oil
canning.
DECORATIVE FORMED METAL 05 75 00 - 2